Fushi no Sougishi

This is the story of the hero who must kill the princess.

This is a world where the dead are sent to the final rest by the Immortal Undertakes

a race of long-lived beings who look human.

Leon, a half-breed, is the youngest of them and is on his way to take his final test when his train falls off its tracks.

He meets a human girl in the forest and though he doesn’t know her

he somehow feels he must protect her… from the other Undertakers! (Source: Mangamo)